Mass spectrometer



FIG. 1 is a perspective view of a mass spectrometer showing the design.

FIG. 2 is a front elevation view of the design.

FIG. 3 is a rear elevation view of the design.

FIG. 4 is a side elevation view of the design; and,

FIG. 5 is a top plan view of the design.

The portions of the mass spectrometer shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a mass spectrometer, as shown and described. 